| 摘要 |
<p>and fluorophosphoric acids are produced by heating together at 120-350 degrees C, a) and acidic phosphate which may be (mono fluoro) phosphoric acid with b) a fluorosulphonate contg. material which may be a fluorosulphonate-fluoride or mixtures of fluoride and fluorosulphonate, of an alkali(ne earth) metal esp. Ca or Ba. Pref. the ratio of a:b is approx. 1:4 and more particularly 1:2-3. cpds. b) may be prepd. by reacting CaF2 and/or BaF2 with SO3 at 150-350 degrees C at up to 0.7 kg/cm2 gauge.</p> |
